Rimwe Educational Resources LLC

04/27/2026

World's largest collection of Olympiad-level math problems now available to everyone! Check it out here: https://mathnet.mit.edu/

"Every year, the countries competing in the International Mathematical Olympiad arrive with a booklet of their best, most original problems. Those booklets get shared among delegations, then quietly disappear. No one had ever collected them systematically, cleaned them, and made them available—not for AI researchers testing the limits of mathematical reasoning, and not for the students around the world training for these competitions largely on their own.

Researchers at MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL), King Abdullah University of Science and Technology (KAUST), and HUMAIN have now done exactly that." (see https://phys.org/news/2026-04-world-largest-olympiad-math-problems.html)

Browse, search, and learn from 30,000+ Olympiad-level math problems across 47 countries and 17 languages.

04/17/2026

Love it when I learn about interesting real-life applications of math!

04/16/2026

Wednesday is World Art Day, an opportunity to reflect on how art brings people together around shared values.

Art also fosters creativity, innovation and cultural diversity, helps spread knowledge, and inspires curiosity and dialogue.

04/16/2026

Statistical Hypothesis Testing
This infographic, titled "How to Understand Statistical Hypothesis Testing," provides a comprehensive visual breakdown of the core concepts used in inferential statistics. It follows a clean, modular design with color-coded sections to help students and professionals navigate the complexities of making data-driven decisions.
Key Sections:
* Defining Hypothesis Testing: Explains the transition from population parameters to sample statistics and the conceptual framework of using an estimator to reach a decision.
* Key Test Components: Breaks down the Null (H_0) and Alternative (H_1) hypotheses, the \alpha-level (significance), and visualizes the rejection vs. acceptance regions on a distribution curve.
* Understanding Errors: Features a "Hypothesis Testing Error Matrix" that clarifies the difference between Type I Errors (False Positives) and Type II Errors (False Negatives), as well as the concept of Statistical Power.
* Decision Rules & p-values: Contrasts large vs. small p-values, showing exactly how they relate to the critical region and the decision to either "Reject" or "Fail to Reject" the null hypothesis.
* One-Tailed vs. Two-Tailed Tests: Visualizes the differences in directional testing, illustrating Left-Tail, Right-Tail, and Two-Tailed distributions.
* Application Best Practices: Offers practical advice, such as checking test assumptions, reporting effect sizes, and the importance of sample size

04/16/2026

A mini baking soda rocket is a great garden science activity!

Remember to stand back as the rocket shoots up quickly.

https://www.science-sparks.com/baking-soda-rocket/

04/16/2026

04/02/2026

04/02/2026

fun!

Build a parachute for an egg this Easter.

https://www.science-sparks.com/gravity-and-air-resistance/

04/02/2026

One of the classics!

This easy Easter STEM challenge is to build a harness to safely transport a small egg down a zip wire. Once you've built a suitable harness for a chocolate egg, you could try a real egg (maybe boil it first) and test whether the harness works for that as well.

Mini zip lines are a great way to learn about friction and changing gradients. Just remember to only change one variable at a time!

FREE instructions and worksheet!

https://www.science-sparks.com/egg-stem-challenge/

04/02/2026

03/14/2026

03/14/2026

Happy !

The ratio of a circle's circumference to its diameter is always the same: 3.14159... and on and on (literally!) forever. This irrational number, pi, has an infinite number of digits, so we'll never figure out its exact value no matter how close we seem to get. Reynaldo Lopes explains pi's vast appli...